1. In any county which contains facilities which are operated by the department of corrections with a total average yearly inmate population in excess of seven hundred and fifty persons but less than one thousand five hundred persons, the prosecuting attorney shall receive ten thousand dollars per annum in addition to all other compensation provided by law. In any county which contains facilities which are operated by the department of corrections with a total average yearly inmate population in excess of one thousand five hundred persons but less than three thousand persons, the prosecuting attorney shall receive twelve thousand five hundred dollars per annum in addition to all other compensation provided by law. In any county which contains facilities which are operated by the department of corrections with a total average yearly inmate population in excess of three thousand persons but less than four thousand persons, the prosecuting attorney shall receive fifteen thousand dollars per annum in addition to all other compensation provided by law. In any county which contains facilities which are operated by the department of corrections with a total average inmate population in excess of four thousand persons, the prosecuting attorney shall receive twenty thousand dollars per annum in addition to all other compensation provided by law. The compensation provided in connection with the average inmate population shall not be considered for purposes of determining any increase in compensation from January 1, 1988. The amounts provided in this subsection shall be included in the computation of the maximum allowable compensation as that term is used in section 50.333.

2. Notwithstanding the provisions of section 56.360, the prosecuting attorney of any county of the fourth classification, with a population of at least forty-eight thousand and not more than sixty thousand inhabitants, two correctional facilities and a state mental health center, shall devote full time to the prosecutor’s office, and, except for the performance of official duties, shall not engage in the practice of law.